500 g of water is poured into the calorimeter at a temperature of 15 C. A piece of ice weighing 0.5 kg is lowered into the water at a temperature of -10 C. Find the temperature of the mixture after thermal equilibrium is established. The specific heat capacity of water is 4.2 kJ/kg K, ice - 2.1 kJ/kg K. The specific heat of melting of ice is 3.3 * 105 J/kg.

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